名词
中文翻译：密度指数
同义词：
['specific gravity', 'density']
例句：
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1.The density index of the soil is crucial for plant growth.
土壤的密度指数对植物生长至关重要。
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2.The density index of the oil is high, indicating a high purity.
这种油的密度指数很高，表明纯度高。
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3.The density index of the water is low, suggesting poor quality.
水的密度指数低，暗示质量差。